A male neonate is born at term to a 28-year-old woman following an uncomplicated pregnancy and vaginal delivery. Heart sounds are auscultated on the right. Abdominal ultrasound shows no evidence of a spleen. Blood smear shows Howell-Jolly bodies. This neonate is at greatest risk for development of which of the following?
Autoantibodies
Macrocytic anemia
Microcytic anemia
Sepsis
Thrombocytosis
